﻿using Esponce.Common;
using Esponce.Models;
using System;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

// The Split App template is documented at http://go.microsoft.com/fwlink/?LinkId=234228

namespace Esponce
{
	/// <summary>
	/// Provides application-specific behavior to supplement the default Application class.
	/// </summary>
	sealed partial class App : Application
	{
		public static Page View
		{
			get;
			set;
		}

		public static MainViewModel ViewModel
		{
			get;
			set;
		}

		/// <summary>
		/// Initializes the singleton Application object.  This is the first line of authored code
		/// executed, and as such is the logical equivalent of main() or WinMain().
		/// </summary>
		public App()
		{
			this.InitializeComponent();
			this.Suspending += OnSuspending;
		}

		/// <summary>
		/// Invoked when the application is launched normally by the end user.  Other entry points
		/// will be used when the application is launched to open a specific file, to display
		/// search results, and so forth.
		/// </summary>
		/// <param name="args">Details about the launch request and process.</param>
		protected override async void OnLaunched(LaunchActivatedEventArgs args)
		{
			Frame rootFrame = Window.Current.Content as Frame;

			// Do not repeat app initialization when the Window already has content,
			// just ensure that the window is active

			if (rootFrame == null)
			{
				// Create a Frame to act as the navigation context and navigate to the first page
				rootFrame = new Frame();
				//Associate the frame with a SuspensionManager key                                
				SuspensionManager.RegisterFrame(rootFrame, "AppFrame");

				if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
				{
					// Restore the saved session state only when appropriate
					try
					{
						await SuspensionManager.RestoreAsync();
					}
					catch (SuspensionManagerException)
					{
						//Something went wrong restoring state.
						//Assume there is no state and continue
					}
				}

				// Place the frame in the current Window
				Window.Current.Content = rootFrame;
			}
			if (rootFrame.Content == null)
			{
				// When the navigation stack isn't restored navigate to the first page,
				// configuring the new page by passing required information as a navigation
				// parameter
				if (!rootFrame.Navigate(typeof(MainPage), "AllGroups"))
				{
					throw new Exception("Failed to create initial page");
				}
			}
			// Ensure the current window is active
			Window.Current.Activate();
		}

		/// <summary>
		/// Invoked when application execution is being suspended.  Application state is saved
		/// without knowing whether the application will be terminated or resumed with the contents
		/// of memory still intact.
		/// </summary>
		/// <param name="sender">The source of the suspend request.</param>
		/// <param name="e">Details about the suspend request.</param>
		private async void OnSuspending(object sender, SuspendingEventArgs e)
		{
			var deferral = e.SuspendingOperation.GetDeferral();
			await SuspensionManager.SaveAsync();
			deferral.Complete();
		}
	}
}
